We must do something to _____ the factories sending outpoisonous gases so as to keep the city_____.[ ]

The weather in China is different from ________ in England.

Why do you like to go shopping in this shop—Because it’s ________ to shop there.I pass by it on my way home from work.

we werelistening to the speech attentively, a voice _____ to announce the result of theelection

______ exercise you take, _______ you’ll be.